Merge branch 'release/5.0.0.rc1' into develop

* release/5.0.0.rc1:
  * Mongoid 4.0.0.rc1 support * Removed debugger
* Mongoid 4.0.0.rc2 support
Merge branch 'release/5.0.0-rc2'

* release/5.0.0-rc2:
  * Mongoid 4.0.0.rc2 support